Add defer attribute to javascript_include_tag Rails

Question

Is there some way to add the defer attribute easily using the javascript_include_tag helper in Rails?

I.e., is there some easy way to turn

<%= javascript_include_tag "blah.js" %>

into

<script defer src="blah.js"></script>

Morpheme

Answer 1

<%= javascript_include_tag "blah.js", :defer => "defer" %>

This will get you (in development):

<script defer="defer" src="/assets/blah.js" type="text/javascript"></script>

Floss

For those interested, here is the link to the docs: w3.org/TR/html4/interact/scripts.html#edef-SCRIPT – Floss

This also works great with middleman which also uses sprokets / asset pipeline. – Agoraphobia

Strange, they don't have any example of async and difer in APIDoc :\ – Frosty

A bit simpler, same result: <%= javascript_include_tag "blah.js", defer: true %> – Vaccination

Answer 2

You can also do

<%= javascript_include_tag "blah.js", defer: true %>

which is more consistent with other switches.

Accelerant